Improvement in polishing stone slabs



J'. FINN.

Polishing Stone Slabs.

910,147,490 PafentedFeb.17,1s 74.

UNITED STATES PATENT OFFICE..

JAMES FINN, OF BOSTON, MASSA-XLHUSETTS IMPROVEMENT INA POLISHING STONESLABS.

Specification forming part of Leiters Patent No. 147,490, dated February17d, 1874 application iifed September 24, 1873.

To all whom z't/may concern:

VBe it known that I, JAMES FINN, of Boston, of the county of Suifolk andState of Massachusetts, have made or invented a new and useful inventionor machine for preparing stones of either equal or diii'erentthicknesses, for being reduced or polished 5 and I do hereby declare thesame to be fully described in the following specification andrepresented in the accompanying drawings, of which- Figure 1 denotes atop view, Fig. 2 a front elevation, Fig. 3 a vertical and longitudinalsection, and Fig. '-.1- an end elevation, of the said machine.

The main essential features of the machine or invention consist in arotary table and a frame for supporting such table, the table beingprovidedwith clamps or devices for fastening to it a slab, for use inmanner as hereinafter explained. The rotary table is pro-` vided withmechanism for revolving it, and it also has mechanism for varying itsaltitude. The carriage is to pass underneath the table, and from thenceoutward upon a railway to lead to a machine for grinding,polishing, orreducing the stones. y

In such drawings, A denotes the frame for supporting the main operativeparts, there being arranged within such fra-nie a rotary table, B. 'Thistable is fixed at its middle upon a horizontal shaft, C, whose journalsc 7) are supported in bearings in two connected levers, l) D', arrangedat opposite ends of the frame A, and pivoted thereto. rlhe pivots orfulcrums of such levers are represented at b bin Figs. 1 and et. twolevers I) 1) are connected by a ba-r, E, provided at its middle with arocker screwnut, F, which receives a vertical screw,rG, so applied tothe iioor H as to be capable of being revolved horizont-ally, but not ofbeing moved vertically. The shank of the screw is provided with a"hand-wheel, c, to enable the screw to be turned by manual power, thesame serving to move the table up or down, as occasion may require. Onthe outer journal of the shaft C there is fixed a worm-gear, d, whichengages with a worm or screw, c, carried by a shaft, f. rIhis shaft issupported in two struts, g g, extended upward from the lever D. There isa crank-wheel, 71, on the outer end of the The longer arms of theshaftf. By revolving the said crank-wheel, the table may be turned orrevolved in a vertical plane. Near the corners of the table, and to eachof its opposite longer sides, there is extended up from the table twoscrews, i fe', upon which `are screwed clamp nuts or levers k 7c, suchdevices being for fastening a slab or plate, I, to the table, whenarranged over it in manner as represented. Within the frame A, anduponthe door on which it rests, and to extend from the said frame to apolishing or reducing machine, is a railway, K K., upon which is placeda wheel-carriage, L, capable of being run within the frame A andunderneath the rotary table thereof. The top or platform l' of therailway-carriage L may be provided with a series of friction wheels orrollers, m m, arranged within and to project above it, in manner asshown in the drawings.

Fig. 5 denotes atop view, and Fig. 6 a longitudinal section, of a seriesof stones, a a '11, and their supporting-slab I, as arranged andconnected through the agency of the abovedescribed machine. r

If we suppose we have a number of slabs or pieces, a, of marble, varyingin their thickness, they are first to be placed edge to edge upon thetop of the table, whereby their lower surfaces will be brought into oneplane, Af ter this has been done, a mortar or a setting composition ofplaster-of-paris and water is to be spread to sutiicient depth over theseries of stones and between them, after which the slab I is-to be laidupon the composition or mass of plaster and brought into parallelismwith the table, there being between the slab and the several stones asufficient amount of the plaster to cement it to them, and compose, whenthe plaster may beset, a bed for each stone to rest in. The slab havingthus been arranged, the lever-nuts of the table should be turned ontheir screws and down upon the slab, so as to confine it to the table.After the plaster may have become set, the table, by mea-ns of themechanism for revolving it, is to'be turned over one hundred and eightydegrees, so as to bring the slab and the stones underneath it, and theslab underneath the stones. Next, the railway-carriage is to be run inunderneath the slab, an d the table with the slab to be lowered untilthe slab may be deposited on the top of the carriage or thefriction-Wheels thereof. Next, the fastening lever-nuts of the slab areto be turned back upon their screws, in order to release the slab fromthe table, after which the carriage with the slab on it, and with thestones to be reduced or polished resting on the slab, is to be run outfrom underneath the table and moved to the polishing or reducing`machine, to and upon-whose table the slab is subsequently to be movedfrom the carriage. The several stones to be reduced or polished Willthen be above the slab, and have their upper faces in or about in oneplane, and thus will be rmly held in place by the slab and the bed ofplas ter upon it.

I claim as my invention as follows, viz:

The machine, substantially as and for the plnpose described, composed ofthe frame A, the rotary table B, and the mechanism for supporting andrevolving,` the table and moving` it vertically, the said table beingprovided with devices for securing a slab to it, as set forth.

JAMES FINN.

Vv'itnesses R. H. EDDY, J. R. SNOW.

